Open Post in new window?

add target="_blank" to the link html code of the linked post titles in index.php(?) and archive.php … (where ever a list of posts with a linked post title appears)

https://www.w3schools.com/tags/att_a_target.asp

example (of twenty ten in loop.php) changed to open in new window:

<h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark" target="_blank"><?php the_title(); ?></a></h2>

Sweet!
Thats the more difficult part is to find out where the post links are being generated. Thats the issue- will they all be in the loop?

that will depend on the theme you are using;

mostly the links are in the pages which show multiple posts, such as index.php, home.php, archive.php, category.php, search.php, tag.php …

in some themes these templates might be calling loop.php where you may find the link;
other theme might have this in some functions…

Great- good point!
I will go a hunt for it! Thanks a lot.

For anyone searching this topic:
I’ve searched for the code alchymyth posted, and several variations in other plug-ins and I found it. I cant find it in all plug-ins but I’m still looking.